Update stan/math/prim/functor/integrate_1d.hpp
Update stan/math/prim/functor/integrate_1d.hpp

Co-authored-by: Steve Bronder <0f2fb86a0f2d6cb94d34747e21234c0fe48b0ce5@gmail.com>
stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math